/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/

/*
 *  NIST SP800-38D compliant GCM implementation
 *
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */

/*
 * http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf
 *
 * See also:
 * [MGV] http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/gcm/gcm-revised-spec.pdf
 *
 * We use the algorithm described as Shoup's method with 4-bit tables in
 * [MGV] 4.1, pp. 12-13, to enhance speed without using too much memory.
 */

#include "tls/config.h"

#if defined(MBEDTLS_GCM_C)

#include "tls/gcm.h"

#include <string.h>

#if defined(MBEDTLS_AESNI_C)
#include "tls/aesni.h"
#endif

#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
#if defined(MBEDTLS_PLATFORM_C)
#include "tls/platform.h"
#else
#include <stdio.h>
#define mbedtls_printf printf
#endif							/* MBEDTLS_PLATFORM_C */
#endif							/* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */

/*
 * 32-bit integer manipulation macros (big endian)
 */
#ifndef GET_UINT32_BE
#define GET_UINT32_BE(n, b, i)                            \
{                                                       \
	(n) = ((uint32_t)(b)[(i)] << 24)             \
		| ((uint32_t)(b)[(i) + 1] << 16)             \
		| ((uint32_t)(b)[(i) + 2] <<  8)             \
		| ((uint32_t)(b)[(i) + 3]);            \
}
#endif

#ifndef PUT_UINT32_BE
#define PUT_UINT32_BE(n, b, i)                            \
{                                                       \
	(b)[(i)] = (unsigned char)((n) >> 24);       \
	(b)[(i) + 1] = (unsigned char)((n) >> 16);       \
	(b)[(i) + 2] = (unsigned char)((n) >>  8);       \
	(b)[(i) + 3] = (unsigned char)((n));       \
}
#endif

/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize(void *v, size_t n)
{
	volatile unsigned char *p = v;
	while (n--) {
		*p++ = 0;
	}
}

/*
 * Initialize a context
 */
void mbedtls_gcm_init(mbedtls_gcm_context *ctx)
{
	memset(ctx, 0, sizeof(mbedtls_gcm_context));
}

/*
 * Precompute small multiples of H, that is set
 *      HH[i] || HL[i] = H times i,
 * where i is seen as a field element as in [MGV], ie high-order bits
 * correspond to low powers of P. The result is stored in the same way, that
 * is the high-order bit of HH corresponds to P^0 and the low-order bit of HL
 * corresponds to P^127.
 */
static int gcm_gen_table(mbedtls_gcm_context *ctx)
{
	int ret, i, j;
	uint64_t hi, lo;
	uint64_t vl, vh;
	unsigned char h[16];
	size_t olen = 0;

	memset(h, 0, 16);
	if ((ret = mbedtls_cipher_update(&ctx->cipher_ctx, h, 16, h, &olen)) != 0) {
		return (ret);
	}

	/* pack h as two 64-bits ints, big-endian */
	GET_UINT32_BE(hi, h, 0);
	GET_UINT32_BE(lo, h, 4);
	vh = (uint64_t)hi << 32 | lo;

	GET_UINT32_BE(hi, h, 8);
	GET_UINT32_BE(lo, h, 12);
	vl = (uint64_t)hi << 32 | lo;

	/* 8 = 1000 corresponds to 1 in GF(2^128) */
	ctx->HL[8] = vl;
	ctx->HH[8] = vh;

#if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
	/* With CLMUL support, we need only h, not the rest of the table */
	if (mbedtls_aesni_has_support(MBEDTLS_AESNI_CLMUL)) {
		return (0);
	}
#endif

	/* 0 corresponds to 0 in GF(2^128) */
	ctx->HH[0] = 0;
	ctx->HL[0] = 0;

	for (i = 4; i > 0; i >>= 1) {
		uint32_t T = (vl & 1) * 0xe1000000U;
		vl = (vh << 63) | (vl >> 1);
		vh = (vh >> 1) ^ ((uint64_t)T << 32);

		ctx->HL[i] = vl;
		ctx->HH[i] = vh;
	}

	for (i = 2; i <= 8; i *= 2) {
		uint64_t *HiL = ctx->HL + i, *HiH = ctx->HH + i;
		vh = *HiH;
		vl = *HiL;
		for (j = 1; j < i; j++) {
			HiH[j] = vh ^ ctx->HH[j];
			HiL[j] = vl ^ ctx->HL[j];
		}
	}

	return (0);
}

int mbedtls_gcm_setkey(mbedtls_gcm_context *ctx, mbedtls_cipher_id_t cipher, const unsigned char *key, unsigned int keybits)
{
	int ret;
	const mbedtls_cipher_info_t *cipher_info;

	cipher_info = mbedtls_cipher_info_from_values(cipher, keybits, MBEDTLS_MODE_ECB);
	if (cipher_info == NULL) {
		return (MBEDTLS_ERR_GCM_BAD_INPUT);
	}

	if (cipher_info->block_size != 16) {
		return (MBEDTLS_ERR_GCM_BAD_INPUT);
	}

	mbedtls_cipher_free(&ctx->cipher_ctx);

	if ((ret = mbedtls_cipher_setup(&ctx->cipher_ctx, cipher_info)) != 0) {
		return (ret);
	}

	if ((ret = mbedtls_cipher_setkey(&ctx->cipher_ctx, key, keybits, MBEDTLS_ENCRYPT)) != 0) {
		return (ret);
	}

	if ((ret = gcm_gen_table(ctx)) != 0) {
		return (ret);
	}

	return (0);
}

/*
 * Shoup's method for multiplication use this table with
 *      last4[x] = x times P^128
 * where x and last4[x] are seen as elements of GF(2^128) as in [MGV]
 */
static const uint64_t last4[16] = {
	0x0000, 0x1c20, 0x3840, 0x2460,
	0x7080, 0x6ca0, 0x48c0, 0x54e0,
	0xe100, 0xfd20, 0xd940, 0xc560,
	0x9180, 0x8da0, 0xa9c0, 0xb5e0
};

/*
 * Sets output to x times H using the precomputed tables.
 * x and output are seen as elements of GF(2^128) as in [MGV].
 */
static void gcm_mult(mbedtls_gcm_context *ctx, const unsigned char x[16], unsigned char output[16])
{
	int i = 0;
	unsigned char lo, hi, rem;
	uint64_t zh, zl;

#if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
	if (mbedtls_aesni_has_support(MBEDTLS_AESNI_CLMUL)) {
		unsigned char h[16];

		PUT_UINT32_BE(ctx->HH[8] >> 32, h, 0);
		PUT_UINT32_BE(ctx->HH[8], h, 4);
		PUT_UINT32_BE(ctx->HL[8] >> 32, h, 8);
		PUT_UINT32_BE(ctx->HL[8], h, 12);

		mbedtls_aesni_gcm_mult(output, x, h);
		return;
	}
#endif							/* MBEDTLS_AESNI_C && MBEDTLS_HAVE_X86_64 */

	lo = x[15] & 0xf;

	zh = ctx->HH[lo];
	zl = ctx->HL[lo];

	for (i = 15; i >= 0; i--) {
		lo = x[i] & 0xf;
		hi = x[i] >> 4;

		if (i != 15) {
			rem = (unsigned char)zl & 0xf;
			zl = (zh << 60) | (zl >> 4);
			zh = (zh >> 4);
			zh ^= (uint64_t)last4[rem] << 48;
			zh ^= ctx->HH[lo];
			zl ^= ctx->HL[lo];

		}

		rem = (unsigned char)zl & 0xf;
		zl = (zh << 60) | (zl >> 4);
		zh = (zh >> 4);
		zh ^= (uint64_t)last4[rem] << 48;
		zh ^= ctx->HH[hi];
		zl ^= ctx->HL[hi];
	}

	PUT_UINT32_BE(zh >> 32, output, 0);
	PUT_UINT32_BE(zh, output, 4);
	PUT_UINT32_BE(zl >> 32, output, 8);
	PUT_UINT32_BE(zl, output, 12);
}

int mbedtls_gcm_starts(mbedtls_gcm_context *ctx, int mode, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len)
{
	int ret;
	unsigned char work_buf[16];
	size_t i;
	const unsigned char *p;
	size_t use_len, olen = 0;

	/* IV and AD are limited to 2^64 bits, so 2^61 bytes */
	if (((uint64_t)iv_len) >> 61 != 0 || ((uint64_t)add_len) >> 61 != 0) {
		return (MBEDTLS_ERR_GCM_BAD_INPUT);
	}

	memset(ctx->y, 0x00, sizeof(ctx->y));
	memset(ctx->buf, 0x00, sizeof(ctx->buf));

	ctx->mode = mode;
	ctx->len = 0;
	ctx->add_len = 0;

	if (iv_len == 12) {
		memcpy(ctx->y, iv, iv_len);
		ctx->y[15] = 1;
	} else {
		memset(work_buf, 0x00, 16);
		PUT_UINT32_BE(iv_len * 8, work_buf, 12);

		p = iv;
		while (iv_len > 0) {
			use_len = (iv_len < 16) ? iv_len : 16;

			for (i = 0; i < use_len; i++) {
				ctx->y[i] ^= p[i];
			}

			gcm_mult(ctx, ctx->y, ctx->y);

			iv_len -= use_len;
			p += use_len;
		}

		for (i = 0; i < 16; i++) {
			ctx->y[i] ^= work_buf[i];
		}

		gcm_mult(ctx, ctx->y, ctx->y);
	}

	if ((ret = mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ctx->base_ectr, &olen)) != 0) {
		return (ret);
	}

	ctx->add_len = add_len;
	p = add;
	while (add_len > 0) {
		use_len = (add_len < 16) ? add_len : 16;

		for (i = 0; i < use_len; i++) {
			ctx->buf[i] ^= p[i];
		}

		gcm_mult(ctx, ctx->buf, ctx->buf);

		add_len -= use_len;
		p += use_len;
	}

	return (0);
}

int mbedtls_gcm_update(mbedtls_gcm_context *ctx, size_t length, const unsigned char *input, unsigned char *output)
{
	int ret;
	unsigned char ectr[16];
	size_t i;
	const unsigned char *p;
	unsigned char *out_p = output;
	size_t use_len, olen = 0;

	if (output > input && (size_t)(output - input) < length) {
		return (MBEDTLS_ERR_GCM_BAD_INPUT);
	}

	/* Total length is restricted to 2^39 - 256 bits, ie 2^36 - 2^5 bytes
	 * Also check for possible overflow */
	if (ctx->len + length < ctx->len || (uint64_t)ctx->len + length > 0xFFFFFFFE0ull) {
		return (MBEDTLS_ERR_GCM_BAD_INPUT);
	}

	ctx->len += length;

	p = input;
	while (length > 0) {
		use_len = (length < 16) ? length : 16;

		for (i = 16; i > 12; i--)
			if (++ctx->y[i - 1] != 0) {
				break;
			}

		if ((ret = mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ectr, &olen)) != 0) {
			return (ret);
		}

		for (i = 0; i < use_len; i++) {
			if (ctx->mode == MBEDTLS_GCM_DECRYPT) {
				ctx->buf[i] ^= p[i];
			}
			out_p[i] = ectr[i] ^ p[i];
			if (ctx->mode == MBEDTLS_GCM_ENCRYPT) {
				ctx->buf[i] ^= out_p[i];
			}
		}

		gcm_mult(ctx, ctx->buf, ctx->buf);

		length -= use_len;
		p += use_len;
		out_p += use_len;
	}

	return (0);
}

int mbedtls_gcm_finish(mbedtls_gcm_context *ctx, unsigned char *tag, size_t tag_len)
{
	unsigned char work_buf[16];
	size_t i;
	uint64_t orig_len = ctx->len * 8;
	uint64_t orig_add_len = ctx->add_len * 8;

	if (tag_len > 16 || tag_len < 4) {
		return (MBEDTLS_ERR_GCM_BAD_INPUT);
	}

	memcpy(tag, ctx->base_ectr, tag_len);

	if (orig_len || orig_add_len) {
		memset(work_buf, 0x00, 16);

		PUT_UINT32_BE((orig_add_len >> 32), work_buf, 0);
		PUT_UINT32_BE((orig_add_len), work_buf, 4);
		PUT_UINT32_BE((orig_len >> 32), work_buf, 8);
		PUT_UINT32_BE((orig_len), work_buf, 12);

		for (i = 0; i < 16; i++) {
			ctx->buf[i] ^= work_buf[i];
		}

		gcm_mult(ctx, ctx->buf, ctx->buf);

		for (i = 0; i < tag_len; i++) {
			tag[i] ^= ctx->buf[i];
		}
	}

	return (0);
}

int mbedtls_gcm_crypt_and_tag(mbedtls_gcm_context *ctx, int mode, size_t length, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len, const unsigned char *input, unsigned char *output, size_t tag_len, unsigned char *tag)
{
	int ret;

	if ((ret = mbedtls_gcm_starts(ctx, mode, iv, iv_len, add, add_len)) != 0) {
		return (ret);
	}

	if ((ret = mbedtls_gcm_update(ctx, length, input, output)) != 0) {
		return (ret);
	}

	if ((ret = mbedtls_gcm_finish(ctx, tag, tag_len)) != 0) {
		return (ret);
	}

	return (0);
}

int mbedtls_gcm_auth_decrypt(mbedtls_gcm_context *ctx, size_t length, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len, const unsigned char *tag, size_t tag_len, const unsigned char *input, unsigned char *output)
{
	int ret;
	unsigned char check_tag[16];
	size_t i;
	int diff;

	if ((ret = mbedtls_gcm_crypt_and_tag(ctx, MBEDTLS_GCM_DECRYPT, length, iv, iv_len, add, add_len, input, output, tag_len, check_tag)) != 0) {
		return (ret);
	}

	/* Check tag in "constant-time" */
	for (diff = 0, i = 0; i < tag_len; i++) {
		diff |= tag[i] ^ check_tag[i];
	}

	if (diff != 0) {
		mbedtls_zeroize(output, length);
		return (MBEDTLS_ERR_GCM_AUTH_FAILED);
	}

	return (0);
}

void mbedtls_gcm_free(mbedtls_gcm_context *ctx)
{
	mbedtls_cipher_free(&ctx->cipher_ctx);
	mbedtls_zeroize(ctx, sizeof(mbedtls_gcm_context));
}

#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
/*
 * AES-GCM test vectors from:
 *
 * http://csrc.nist.gov/groups/STM/cavp/documents/mac/gcmtestvectors.zip
 */
#define MAX_TESTS   6

static const int key_index[MAX_TESTS] = { 0, 0, 1, 1, 1, 1 };

static const unsigned char key[MAX_TESTS][32] = {
	{
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
	},
	{
		0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
		0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
		0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
		0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08
	},
};

static const size_t iv_len[MAX_TESTS] = { 12, 12, 12, 12, 8, 60 };

static const int iv_index[MAX_TESTS] = { 0, 0, 1, 1, 1, 2 };

static const unsigned char iv[MAX_TESTS][64] = {
	{
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00
	},
	{
		0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad,
		0xde, 0xca, 0xf8, 0x88
	},
	{
		0x93, 0x13, 0x22, 0x5d, 0xf8, 0x84, 0x06, 0xe5,
		0x55, 0x90, 0x9c, 0x5a, 0xff, 0x52, 0x69, 0xaa,
		0x6a, 0x7a, 0x95, 0x38, 0x53, 0x4f, 0x7d, 0xa1,
		0xe4, 0xc3, 0x03, 0xd2, 0xa3, 0x18, 0xa7, 0x28,
		0xc3, 0xc0, 0xc9, 0x51, 0x56, 0x80, 0x95, 0x39,
		0xfc, 0xf0, 0xe2, 0x42, 0x9a, 0x6b, 0x52, 0x54,
		0x16, 0xae, 0xdb, 0xf5, 0xa0, 0xde, 0x6a, 0x57,
		0xa6, 0x37, 0xb3, 0x9b
	},
};

static const size_t add_len[MAX_TESTS] = { 0, 0, 0, 20, 20, 20 };

static const int add_index[MAX_TESTS] = { 0, 0, 0, 1, 1, 1 };

static const unsigned char additional[MAX_TESTS][64] = {
	{0x00},
	{
		0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
		0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
		0xab, 0xad, 0xda, 0xd2
	},
};

static const size_t pt_len[MAX_TESTS] = { 0, 16, 64, 60, 60, 60 };

static const int pt_index[MAX_TESTS] = { 0, 0, 1, 1, 1, 1 };

static const unsigned char pt[MAX_TESTS][64] = {
	{
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
	},
	{
		0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5,
		0xa5, 0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a,
		0x86, 0xa7, 0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda,
		0x2e, 0x4c, 0x30, 0x3d, 0x8a, 0x31, 0x8a, 0x72,
		0x1c, 0x3c, 0x0c, 0x95, 0x95, 0x68, 0x09, 0x53,
		0x2f, 0xcf, 0x0e, 0x24, 0x49, 0xa6, 0xb5, 0x25,
		0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d, 0xe6, 0x57,
		0xba, 0x63, 0x7b, 0x39, 0x1a, 0xaf, 0xd2, 0x55
	},
};

static const unsigned char ct[MAX_TESTS * 3][64] = {
	{0x00},
	{
		0x03, 0x88, 0xda, 0xce, 0x60, 0xb6, 0xa3, 0x92,
		0xf3, 0x28, 0xc2, 0xb9, 0x71, 0xb2, 0xfe, 0x78
	},
	{
		0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24,
		0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c,
		0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0,
		0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e,
		0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c,
		0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05,
		0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97,
		0x3d, 0x58, 0xe0, 0x91, 0x47, 0x3f, 0x59, 0x85
	},
	{
		0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24,
		0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c,
		0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0,
		0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e,
		0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c,
		0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05,
		0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97,
		0x3d, 0x58, 0xe0, 0x91
	},
	{
		0x61, 0x35, 0x3b, 0x4c, 0x28, 0x06, 0x93, 0x4a,
		0x77, 0x7f, 0xf5, 0x1f, 0xa2, 0x2a, 0x47, 0x55,
		0x69, 0x9b, 0x2a, 0x71, 0x4f, 0xcd, 0xc6, 0xf8,
		0x37, 0x66, 0xe5, 0xf9, 0x7b, 0x6c, 0x74, 0x23,
		0x73, 0x80, 0x69, 0x00, 0xe4, 0x9f, 0x24, 0xb2,
		0x2b, 0x09, 0x75, 0x44, 0xd4, 0x89, 0x6b, 0x42,
		0x49, 0x89, 0xb5, 0xe1, 0xeb, 0xac, 0x0f, 0x07,
		0xc2, 0x3f, 0x45, 0x98
	},
	{
		0x8c, 0xe2, 0x49, 0x98, 0x62, 0x56, 0x15, 0xb6,
		0x03, 0xa0, 0x33, 0xac, 0xa1, 0x3f, 0xb8, 0x94,
		0xbe, 0x91, 0x12, 0xa5, 0xc3, 0xa2, 0x11, 0xa8,
		0xba, 0x26, 0x2a, 0x3c, 0xca, 0x7e, 0x2c, 0xa7,
		0x01, 0xe4, 0xa9, 0xa4, 0xfb, 0xa4, 0x3c, 0x90,
		0xcc, 0xdc, 0xb2, 0x81, 0xd4, 0x8c, 0x7c, 0x6f,
		0xd6, 0x28, 0x75, 0xd2, 0xac, 0xa4, 0x17, 0x03,
		0x4c, 0x34, 0xae, 0xe5
	},
	{0x00},
	{
		0x98, 0xe7, 0x24, 0x7c, 0x07, 0xf0, 0xfe, 0x41,
		0x1c, 0x26, 0x7e, 0x43, 0x84, 0xb0, 0xf6, 0x00
	},
	{
		0x39, 0x80, 0xca, 0x0b, 0x3c, 0x00, 0xe8, 0x41,
		0xeb, 0x06, 0xfa, 0xc4, 0x87, 0x2a, 0x27, 0x57,
		0x85, 0x9e, 0x1c, 0xea, 0xa6, 0xef, 0xd9, 0x84,
		0x62, 0x85, 0x93, 0xb4, 0x0c, 0xa1, 0xe1, 0x9c,
		0x7d, 0x77, 0x3d, 0x00, 0xc1, 0x44, 0xc5, 0x25,
		0xac, 0x61, 0x9d, 0x18, 0xc8, 0x4a, 0x3f, 0x47,
		0x18, 0xe2, 0x44, 0x8b, 0x2f, 0xe3, 0x24, 0xd9,
		0xcc, 0xda, 0x27, 0x10, 0xac, 0xad, 0xe2, 0x56
	},
	{
		0x39, 0x80, 0xca, 0x0b, 0x3c, 0x00, 0xe8, 0x41,
		0xeb, 0x06, 0xfa, 0xc4, 0x87, 0x2a, 0x27, 0x57,
		0x85, 0x9e, 0x1c, 0xea, 0xa6, 0xef, 0xd9, 0x84,
		0x62, 0x85, 0x93, 0xb4, 0x0c, 0xa1, 0xe1, 0x9c,
		0x7d, 0x77, 0x3d, 0x00, 0xc1, 0x44, 0xc5, 0x25,
		0xac, 0x61, 0x9d, 0x18, 0xc8, 0x4a, 0x3f, 0x47,
		0x18, 0xe2, 0x44, 0x8b, 0x2f, 0xe3, 0x24, 0xd9,
		0xcc, 0xda, 0x27, 0x10
	},
	{
		0x0f, 0x10, 0xf5, 0x99, 0xae, 0x14, 0xa1, 0x54,
		0xed, 0x24, 0xb3, 0x6e, 0x25, 0x32, 0x4d, 0xb8,
		0xc5, 0x66, 0x63, 0x2e, 0xf2, 0xbb, 0xb3, 0x4f,
		0x83, 0x47, 0x28, 0x0f, 0xc4, 0x50, 0x70, 0x57,
		0xfd, 0xdc, 0x29, 0xdf, 0x9a, 0x47, 0x1f, 0x75,
		0xc6, 0x65, 0x41, 0xd4, 0xd4, 0xda, 0xd1, 0xc9,
		0xe9, 0x3a, 0x19, 0xa5, 0x8e, 0x8b, 0x47, 0x3f,
		0xa0, 0xf0, 0x62, 0xf7
	},
	{
		0xd2, 0x7e, 0x88, 0x68, 0x1c, 0xe3, 0x24, 0x3c,
		0x48, 0x30, 0x16, 0x5a, 0x8f, 0xdc, 0xf9, 0xff,
		0x1d, 0xe9, 0xa1, 0xd8, 0xe6, 0xb4, 0x47, 0xef,
		0x6e, 0xf7, 0xb7, 0x98, 0x28, 0x66, 0x6e, 0x45,
		0x81, 0xe7, 0x90, 0x12, 0xaf, 0x34, 0xdd, 0xd9,
		0xe2, 0xf0, 0x37, 0x58, 0x9b, 0x29, 0x2d, 0xb3,
		0xe6, 0x7c, 0x03, 0x67, 0x45, 0xfa, 0x22, 0xe7,
		0xe9, 0xb7, 0x37, 0x3b
	},
	{0x00},
	{
		0xce, 0xa7, 0x40, 0x3d, 0x4d, 0x60, 0x6b, 0x6e,
		0x07, 0x4e, 0xc5, 0xd3, 0xba, 0xf3, 0x9d, 0x18
	},
	{
		0x52, 0x2d, 0xc1, 0xf0, 0x99, 0x56, 0x7d, 0x07,
		0xf4, 0x7f, 0x37, 0xa3, 0x2a, 0x84, 0x42, 0x7d,
		0x64, 0x3a, 0x8c, 0xdc, 0xbf, 0xe5, 0xc0, 0xc9,
		0x75, 0x98, 0xa2, 0xbd, 0x25, 0x55, 0xd1, 0xaa,
		0x8c, 0xb0, 0x8e, 0x48, 0x59, 0x0d, 0xbb, 0x3d,
		0xa7, 0xb0, 0x8b, 0x10, 0x56, 0x82, 0x88, 0x38,
		0xc5, 0xf6, 0x1e, 0x63, 0x93, 0xba, 0x7a, 0x0a,
		0xbc, 0xc9, 0xf6, 0x62, 0x89, 0x80, 0x15, 0xad
	},
	{
		0x52, 0x2d, 0xc1, 0xf0, 0x99, 0x56, 0x7d, 0x07,
		0xf4, 0x7f, 0x37, 0xa3, 0x2a, 0x84, 0x42, 0x7d,
		0x64, 0x3a, 0x8c, 0xdc, 0xbf, 0xe5, 0xc0, 0xc9,
		0x75, 0x98, 0xa2, 0xbd, 0x25, 0x55, 0xd1, 0xaa,
		0x8c, 0xb0, 0x8e, 0x48, 0x59, 0x0d, 0xbb, 0x3d,
		0xa7, 0xb0, 0x8b, 0x10, 0x56, 0x82, 0x88, 0x38,
		0xc5, 0xf6, 0x1e, 0x63, 0x93, 0xba, 0x7a, 0x0a,
		0xbc, 0xc9, 0xf6, 0x62
	},
	{
		0xc3, 0x76, 0x2d, 0xf1, 0xca, 0x78, 0x7d, 0x32,
		0xae, 0x47, 0xc1, 0x3b, 0xf1, 0x98, 0x44, 0xcb,
		0xaf, 0x1a, 0xe1, 0x4d, 0x0b, 0x97, 0x6a, 0xfa,
		0xc5, 0x2f, 0xf7, 0xd7, 0x9b, 0xba, 0x9d, 0xe0,
		0xfe, 0xb5, 0x82, 0xd3, 0x39, 0x34, 0xa4, 0xf0,
		0x95, 0x4c, 0xc2, 0x36, 0x3b, 0xc7, 0x3f, 0x78,
		0x62, 0xac, 0x43, 0x0e, 0x64, 0xab, 0xe4, 0x99,
		0xf4, 0x7c, 0x9b, 0x1f
	},
	{
		0x5a, 0x8d, 0xef, 0x2f, 0x0c, 0x9e, 0x53, 0xf1,
		0xf7, 0x5d, 0x78, 0x53, 0x65, 0x9e, 0x2a, 0x20,
		0xee, 0xb2, 0xb2, 0x2a, 0xaf, 0xde, 0x64, 0x19,
		0xa0, 0x58, 0xab, 0x4f, 0x6f, 0x74, 0x6b, 0xf4,
		0x0f, 0xc0, 0xc3, 0xb7, 0x80, 0xf2, 0x44, 0x45,
		0x2d, 0xa3, 0xeb, 0xf1, 0xc5, 0xd8, 0x2c, 0xde,
		0xa2, 0x41, 0x89, 0x97, 0x20, 0x0e, 0xf8, 0x2e,
		0x44, 0xae, 0x7e, 0x3f
	},
};

static const unsigned char tag[MAX_TESTS * 3][16] = {
	{
		0x58, 0xe2, 0xfc, 0xce, 0xfa, 0x7e, 0x30, 0x61,
		0x36, 0x7f, 0x1d, 0x57, 0xa4, 0xe7, 0x45, 0x5a
	},
	{
		0xab, 0x6e, 0x47, 0xd4, 0x2c, 0xec, 0x13, 0xbd,
		0xf5, 0x3a, 0x67, 0xb2, 0x12, 0x57, 0xbd, 0xdf
	},
	{
		0x4d, 0x5c, 0x2a, 0xf3, 0x27, 0xcd, 0x64, 0xa6,
		0x2c, 0xf3, 0x5a, 0xbd, 0x2b, 0xa6, 0xfa, 0xb4
	},
	{
		0x5b, 0xc9, 0x4f, 0xbc, 0x32, 0x21, 0xa5, 0xdb,
		0x94, 0xfa, 0xe9, 0x5a, 0xe7, 0x12, 0x1a, 0x47
	},
	{
		0x36, 0x12, 0xd2, 0xe7, 0x9e, 0x3b, 0x07, 0x85,
		0x56, 0x1b, 0xe1, 0x4a, 0xac, 0xa2, 0xfc, 0xcb
	},
	{
		0x61, 0x9c, 0xc5, 0xae, 0xff, 0xfe, 0x0b, 0xfa,
		0x46, 0x2a, 0xf4, 0x3c, 0x16, 0x99, 0xd0, 0x50
	},
	{
		0xcd, 0x33, 0xb2, 0x8a, 0xc7, 0x73, 0xf7, 0x4b,
		0xa0, 0x0e, 0xd1, 0xf3, 0x12, 0x57, 0x24, 0x35
	},
	{
		0x2f, 0xf5, 0x8d, 0x80, 0x03, 0x39, 0x27, 0xab,
		0x8e, 0xf4, 0xd4, 0x58, 0x75, 0x14, 0xf0, 0xfb
	},
	{
		0x99, 0x24, 0xa7, 0xc8, 0x58, 0x73, 0x36, 0xbf,
		0xb1, 0x18, 0x02, 0x4d, 0xb8, 0x67, 0x4a, 0x14
	},
	{
		0x25, 0x19, 0x49, 0x8e, 0x80, 0xf1, 0x47, 0x8f,
		0x37, 0xba, 0x55, 0xbd, 0x6d, 0x27, 0x61, 0x8c
	},
	{
		0x65, 0xdc, 0xc5, 0x7f, 0xcf, 0x62, 0x3a, 0x24,
		0x09, 0x4f, 0xcc, 0xa4, 0x0d, 0x35, 0x33, 0xf8
	},
	{
		0xdc, 0xf5, 0x66, 0xff, 0x29, 0x1c, 0x25, 0xbb,
		0xb8, 0x56, 0x8f, 0xc3, 0xd3, 0x76, 0xa6, 0xd9
	},
	{
		0x53, 0x0f, 0x8a, 0xfb, 0xc7, 0x45, 0x36, 0xb9,
		0xa9, 0x63, 0xb4, 0xf1, 0xc4, 0xcb, 0x73, 0x8b
	},
	{
		0xd0, 0xd1, 0xc8, 0xa7, 0x99, 0x99, 0x6b, 0xf0,
		0x26, 0x5b, 0x98, 0xb5, 0xd4, 0x8a, 0xb9, 0x19
	},
	{
		0xb0, 0x94, 0xda, 0xc5, 0xd9, 0x34, 0x71, 0xbd,
		0xec, 0x1a, 0x50, 0x22, 0x70, 0xe3, 0xcc, 0x6c
	},
	{
		0x76, 0xfc, 0x6e, 0xce, 0x0f, 0x4e, 0x17, 0x68,
		0xcd, 0xdf, 0x88, 0x53, 0xbb, 0x2d, 0x55, 0x1b
	},
	{
		0x3a, 0x33, 0x7d, 0xbf, 0x46, 0xa7, 0x92, 0xc4,
		0x5e, 0x45, 0x49, 0x13, 0xfe, 0x2e, 0xa8, 0xf2
	},
	{
		0xa4, 0x4a, 0x82, 0x66, 0xee, 0x1c, 0x8e, 0xb0,
		0xc8, 0xb5, 0xd4, 0xcf, 0x5a, 0xe9, 0xf1, 0x9a
	},
};

int mbedtls_gcm_self_test(int verbose)
{
	mbedtls_gcm_context ctx;
	unsigned char buf[64];
	unsigned char tag_buf[16];
	int i, j, ret;
	mbedtls_cipher_id_t cipher = MBEDTLS_CIPHER_ID_AES;

	mbedtls_gcm_init(&ctx);

	for (j = 0; j < 3; j++) {
		int key_len = 128 + 64 * j;

		for (i = 0; i < MAX_TESTS; i++) {
			if (verbose != 0) {
				mbedtls_printf("  AES-GCM-%3d #%d (%s): ", key_len, i, "enc");
			}

			mbedtls_gcm_setkey(&ctx, cipher, key[key_index[i]], key_len);

			ret = mbedtls_gcm_crypt_and_tag(&ctx, MBEDTLS_GCM_ENCRYPT, pt_len[i], iv[iv_index[i]], iv_len[i], additional[add_index[i]], add_len[i], pt[pt_index[i]], buf, 16, tag_buf);

			if (ret != 0 || memcmp(buf, ct[j * 6 + i], pt_len[i]) != 0 || memcmp(tag_buf, tag[j * 6 + i], 16) != 0) {
				if (verbose != 0) {
					mbedtls_printf("failed\n");
				}

				return (1);
			}

			mbedtls_gcm_free(&ctx);

			if (verbose != 0) {
				mbedtls_printf("passed\n");
			}

			if (verbose != 0) {
				mbedtls_printf("  AES-GCM-%3d #%d (%s): ", key_len, i, "dec");
			}

			mbedtls_gcm_setkey(&ctx, cipher, key[key_index[i]], key_len);

			ret = mbedtls_gcm_crypt_and_tag(&ctx, MBEDTLS_GCM_DECRYPT, pt_len[i], iv[iv_index[i]], iv_len[i], additional[add_index[i]], add_len[i], ct[j * 6 + i], buf, 16, tag_buf);

			if (ret != 0 || memcmp(buf, pt[pt_index[i]], pt_len[i]) != 0 || memcmp(tag_buf, tag[j * 6 + i], 16) != 0) {
				if (verbose != 0) {
					mbedtls_printf("failed\n");
				}

				return (1);
			}

			mbedtls_gcm_free(&ctx);

			if (verbose != 0) {
				mbedtls_printf("passed\n");
			}

			if (verbose != 0) {
				mbedtls_printf("  AES-GCM-%3d #%d split (%s): ", key_len, i, "enc");
			}

			mbedtls_gcm_setkey(&ctx, cipher, key[key_index[i]], key_len);

			ret = mbedtls_gcm_starts(&ctx, MBEDTLS_GCM_ENCRYPT, iv[iv_index[i]], iv_len[i], additional[add_index[i]], add_len[i]);
			if (ret != 0) {
				if (verbose != 0) {
					mbedtls_printf("failed\n");
				}

				return (1);
			}

			if (pt_len[i] > 32) {
				size_t rest_len = pt_len[i] - 32;
				ret = mbedtls_gcm_update(&ctx, 32, pt[pt_index[i]], buf);
				if (ret != 0) {
					if (verbose != 0) {
						mbedtls_printf("failed\n");
					}

					return (1);
				}

				ret = mbedtls_gcm_update(&ctx, rest_len, pt[pt_index[i]] + 32, buf + 32);
				if (ret != 0) {
					if (verbose != 0) {
						mbedtls_printf("failed\n");
					}

					return (1);
				}
			} else {
				ret = mbedtls_gcm_update(&ctx, pt_len[i], pt[pt_index[i]], buf);
				if (ret != 0) {
					if (verbose != 0) {
						mbedtls_printf("failed\n");
					}

					return (1);
				}
			}

			ret = mbedtls_gcm_finish(&ctx, tag_buf, 16);
			if (ret != 0 || memcmp(buf, ct[j * 6 + i], pt_len[i]) != 0 || memcmp(tag_buf, tag[j * 6 + i], 16) != 0) {
				if (verbose != 0) {
					mbedtls_printf("failed\n");
				}

				return (1);
			}

			mbedtls_gcm_free(&ctx);

			if (verbose != 0) {
				mbedtls_printf("passed\n");
			}

			if (verbose != 0) {
				mbedtls_printf("  AES-GCM-%3d #%d split (%s): ", key_len, i, "dec");
			}

			mbedtls_gcm_setkey(&ctx, cipher, key[key_index[i]], key_len);

			ret = mbedtls_gcm_starts(&ctx, MBEDTLS_GCM_DECRYPT, iv[iv_index[i]], iv_len[i], additional[add_index[i]], add_len[i]);
			if (ret != 0) {
				if (verbose != 0) {
					mbedtls_printf("failed\n");
				}

				return (1);
			}

			if (pt_len[i] > 32) {
				size_t rest_len = pt_len[i] - 32;
				ret = mbedtls_gcm_update(&ctx, 32, ct[j * 6 + i], buf);
				if (ret != 0) {
					if (verbose != 0) {
						mbedtls_printf("failed\n");
					}

					return (1);
				}

				ret = mbedtls_gcm_update(&ctx, rest_len, ct[j * 6 + i] + 32, buf + 32);
				if (ret != 0) {
					if (verbose != 0) {
						mbedtls_printf("failed\n");
					}

					return (1);
				}
			} else {
				ret = mbedtls_gcm_update(&ctx, pt_len[i], ct[j * 6 + i], buf);
				if (ret != 0) {
					if (verbose != 0) {
						mbedtls_printf("failed\n");
					}

					return (1);
				}
			}

			ret = mbedtls_gcm_finish(&ctx, tag_buf, 16);
			if (ret != 0 || memcmp(buf, pt[pt_index[i]], pt_len[i]) != 0 || memcmp(tag_buf, tag[j * 6 + i], 16) != 0) {
				if (verbose != 0) {
					mbedtls_printf("failed\n");
				}

				return (1);
			}

			mbedtls_gcm_free(&ctx);

			if (verbose != 0) {
				mbedtls_printf("passed\n");
			}

		}
	}

	if (verbose != 0) {
		mbedtls_printf("\n");
	}

	return (0);
}

#endif							/* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */

#endif							/* MBEDTLS_GCM_C */
